99942 Apophis (provisional designation 2004 MN 4) is a near-Earth asteroid and a potentially hazardous object, 450 metres (1,480 ft) by 170 metres (560 ft) in size, [3] that caused a brief period of concern in December 2004 when initial observations indicated a probability of 2.7% that it would hit Earth on Friday, April 13, 2029.

2024年12月20日 · Asteroid 99942 Apophis is a near-Earth object (NEO) estimated to be about 1,100 feet (335 meters) across. When it was discovered in 2004, Apophis was identified as one of the most hazardous asteroids that could impact Earth.

2021年3月26日 · After its discovery in 2004, asteroid 99942 Apophis had been identified as one of the most hazardous asteroids that could impact Earth. But that impact assessment changed as astronomers tracked Apophis and its orbit became better determined.

2024年11月6日 · An asteroid the size of the Empire State Building, named Apophis, could potentially hit Earth in 2029, but scientists consider the chance extremely small.

2024年5月10日 · In just under half a decade, a 1,000-foot-wide (305-meter-wide) asteroid named after the Egyptian god of chaos and destruction, Apophis, will pass within 30,000 miles (48,300 kilometers) of...

On 13 April 2029, the asteroid 99942 Apophis will pass less than 32 000 km from Earth’s surface. Roughly 375 m across on average, Apophis will, for a short time, be closer to Earth than telecommunications satellites in geostationary orbit and visible in the night sky to the naked eye from parts of Europe, Africa and Asia.

2024年11月12日 · To find out, they conducted modeling of the 2029 99942 Apophis flyby of Earth. We don't really know what shape the asteroid has, but what data we have obtained suggest that it is bi-lobed, perhaps a pair of joined objects not unlike the potato-shaped 25143 Itokawa.

99942 Apophis (2004 MN4) is one of the most important near-Earth asteroids ever discovered. It will make a very close Earth approach on Friday, April 13, 2029 when it will pass within 0.1 lunar distances, which is only five Earth radii above Earth's surface (that is, it will miss by about 32000 km or slightly less than 19800 miles).

2024年11月24日 · Asteroid 99942 Apophis, named after the ancient Egyptian deity symbolizing chaos and darkness, is poised for a significant approach to Earth in 2029. This event is not merely an astronomical curiosity; it holds profound implications for our understanding of near-Earth objects and their interactions with planetary bodies.

Researchers at NASA/JPL, Caltech, and Arecibo Observatory have released the results of radar observations of the potentially hazardous asteroid 99942 Apophis, along with an in-depth analysis of its motion.